Rocket Lab has delayed for a day the start of a launch-attempt window to send its Electron rocket into space from its base in Mahia on the East Coast.

It says high winds on the peninsula have forced it to have another go tomorrow.

The company has said weather and other technical factors will dictate whether the test launch can be attempted and what one local described as a nasty southerly blew through at the weekend and will hang around early today.

The wind is forecast to be blowing from the southwest and more an 20km/h from the southwest this morning.